// Copyright (c) 2018, Yubico AB
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// 1. Redistributions of source code must retain the above copyright notice, this
//    list of conditions and the following disclaimer.
//
// 2. Redistributions in binary form must reproduce the above copyright notice,
//    this list of conditions and the following disclaimer in the documentation
//    and/or other materials provided with the distribution.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
// FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
// DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
// SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
// CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
// OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

package com.yubico.webauthn;

import com.yubico.webauthn.data.ByteArray;
import com.yubico.webauthn.data.TokenBindingInfo;
import java.util.Optional;

final class TokenBindingValidator {

  static boolean validate(
      Optional<TokenBindingInfo> clientTokenBinding, Optional<ByteArray> rpTokenBindingId) {
    return rpTokenBindingId
        .map(
            rpToken ->
                clientTokenBinding
                    .map(
                        tbi -> {
                          switch (tbi.getStatus()) {
                            case SUPPORTED:

                            case PRESENT:
                              return tbi.getId()
                                  .map(
                                      id -> {
                                        if (id.equals(rpToken)) {
                                          return true;
                                        } else {
                                          throw new IllegalArgumentException(
                                              "Incorrect token binding ID.");
                                        }
                                      })
                                  .orElseThrow(
                                      () ->
                                          new IllegalArgumentException(
                                              "Property \"id\" missing from \"tokenBinding\" object."));
                          }
                          throw new RuntimeException(
                              "Unknown token binding status: " + tbi.getStatus());
                        })
                    .orElseThrow(
                        () ->
                            new IllegalArgumentException(
                                "Token binding ID set by RP but not by client.")))
        .orElseGet(
            () ->
                clientTokenBinding
                    .map(
                        tbi -> {
                          switch (tbi.getStatus()) {
                            case SUPPORTED:
                              return true;

                            case PRESENT:
                              throw new IllegalArgumentException(
                                  "Token binding ID set by client but not by RP.");
                          }
                          throw new RuntimeException(
                              "Unknown token binding status: " + tbi.getStatus());
                        })
                    .orElse(true));
  }
}
